By Dietrich Knauth NEW YORK (Reuters) -Twelve U.S. states will ask a federal court on Wednesday to halt President Donald Trump's "Liberation Day" tariffs, arguing that he overstepped his authority by declaring a national emergency to impose across-the-board taxes on imports from nations that sell more to the U.

The trade policies under President Donald Trump, particularly the imposition of tariffs on imported goods, may significantly impact American households financially.